The midpoint of

¯¯¯¯¯¯
C
D
is
E
(

1
,
0
)
. One endpoint is
C
(
5
,
2
)
. What are the coordinates of the other endpoint?

1 answer

E = (C+D)/2
D = 2E - C = 2(-1,0) - (5,2) = (-7,-2)